Plumber&#39;s trap.



.l. H. CARR.

PLUMBER'S TRAP.

APPLICATION FILED JAN.,29. 1914.

Patented Aug. 31,1915.

JOHN china, or EVERETT, vnissacnnsnrrs.

' PLUMBER'S TRAP.

To all whom it may concern Be it known that I, JOHN H. CARR, a

citizen of the United States, and resident tween the aforesaid ring andthe discharge pipe, whereby the pipe and ring may brace each other. Forthe latter purpose the pipe and ring may be either integral or separate;but when they are separate they are formed with interlocking portionswhereby they are adapted to have the bracing eifects referred to.

Another object of the invention is to provide a lead trap whose capjoint will be sealed by the liquid in the trap and which will notoverflow when the cap is removed.

These and other objects will be betterunderstood after the structure hasbeen described in detail.

Of the accompanying drawings: Figure 1 represents a vertical sectionthrough a trap embodying one form of my invention. Fig. -2 represents across section of the same in the plane indicated by line w'w of Figs. 1and 3. Fig. 3 represents a view, similar to Fig. 1, of a trap embodyingone feature of my invention in another form. Fig. 4 represents a crosssection of the trap shown by .Fig. 3 in the plane of line w--0.

The same reference characters indicate the same parts wherever theyoccur. The trap, as shown, comprises a cupshaped casing 10 of relativelysoft ductile metal, such as lead, a cap 11, aring 12 for holding saidcap, and an outlet pipe 13 the receiving end of which 'projects into the'casin t- The ca) and rin have coo erative connecting screw-threadsindicated at 14.

The receiving end 15 of the outlet'pipe is arranged at a substantialdistance below the Qrim 16 of the casing in orderto prevent overflow ofthe casing when the cap is re.-

' Specification of Letters Patent.

PatentedAug. 31, 19 115.

1 Application filed January 29, 1914. SeriaINo. 815,191.

moved. The ring 12 is disposed at a substantial distance below thereceiving end 15 of the outlet pipe'so that the screw-threaded ]01Ilt14: will be sealed by liquid when the trap is in use. 1 7

One improvement of the trapconsists in the means whereby the ring 12 issecured in the casing. The ring for this purpose is formed withacontinuous peripheral groove l7and the wall of the casing is offset ordepressed, as indicated at 18,-int0 the groove, the offset portionafiording a firm support for the ring. To guard against any possibilityof leakage between the casing and ring, I apply a ring of solder, asindicated at 9. gasket for the-purpose of forming a tight joint betweenthe cap and ring.

So far as I am aware, thisis the first instance of alead trap having anintegral The element indicated at 2O is a portion extending above thejoint by which the cap is attached, and this feature is due in thepresent instance to the olfsetting of is causedto extend to the sidewall of the casing. I form the joint at the discharge 1 end by cutting ahole in the side wall of the casing, and by then depressing the rim ofthe hole inwardly, by spinning or otherwise, to form a flange 22 adaptedto cooperate with. the outlet pipe to form an annular groove for thereception of solder 23 by which the joint is made tight. The depressingof the casing at this point facilitates the application of the solder23, because when the trap is laid on its side with the joint uppermostthe solder may be readily poured into the annular groove provided forits reception. I prefer to arrange the discharge end ofthe pipesubstantially flush with the periphery of the casing and to form thering of solder 23 so that it will also be 'flush with the periphery ofthe casing. By

thus avoiding projection of the outlet pipe beyond the casing, the jointis less-likely .to develop aleak in consequence of handling. Duringtransportation of the 'traps the boxes in which they are packed areoften dropped, and thus traps whose outlet pipes project beyond thecasing often receive lQlQWS On the projecting pipes which cause thejoints to leak, and the. traps in beingi I have shown the casing asbeingprovided with an inlet hole at 24. This hole will, in

practice, be made" after the traphas been installed, and its locationwill be determined by the direction from which the inlet pipe is led. ra

I Careless persons sometimes apply too much force when attaching thecap- 11, the

cap being provided with suitable means whereby a wrench or other toolmay be used to turn it; and in this instance it is provided with lugs 25between which a'flat tool may be inserted to operate as'a wrench. Thejoint between the lead casing and ring 12, although otherwisestrongenough, may not be suflicient to withstand excessive wrenchingstrains applied to the cap, and for this i reason I provide means-forbracing. the ring against rotative movement relatively to the casing sothat therewill be no-likelihood'of starting a leak between the ring andcasing. In the form shown by Figs. 1 and 2, the means for this purposeis embodied in cooperative abutments on the outlet pipe and ringrespectively. The ring as shown is provided with a horizontal web orflange 26 in which is formed a radial notch 27 and the outlet pipe isprovided with a lug 28 which projects radially so as to occupy the notch27. Whatever rotative strain is imparted by the cap to the ring istransmitted by the web 26 to the lug 28 and thencetothe outlet pipe.Since the discharge end of the outlet pipe is secured to the casing by astrong joint, it is adapted to brace the ring 12 so as to preventrotative movement of the ring. The solder 19 is thus relieved ofrotative strains, and the joint formed thereby will remain tight. Insome cases I'may form the ring 12 and outlet pipe 13 integrally by asingle casting, as shown by Fig. 3, the two parts in this figure beingjoined by a web 26. This web does not wholly surround the outlet pipe,because it is necessary for the liquid to flow upwardly outside the pipe13 in order to pass from the inlet 24 to the receiving end 15 of theoutlet pipe. It does, however, surroundthe' outlet pipe and also toprevent complete discharge of the liquid from the trap'by siphoni'c,action. The flange 26 is adapted to hold the pipe '13 in place while thesolder 23 is being applied, and during this soldering" operation thepipe in Fig. 1 maybe securely held against the flange by inserting awedge or other suitable piece (not shown) between the ring 12 and thepipe, diametrically opposite the lug 28. The discharge pipe, in thisform, need not be placed in the casing until after th'ering 12"has beensecured by depressing the casing into the groove 17, and the pipe may beintroduced through the hole defined by the flange 22. The discharge pipemay, however, be joined to the casing at 22, 23 before the ring 12 isjoined to the casing. In such case, the pipe, having been made fast tothe casing, may be utilized to hold the ring in place during theoperation of spinning'or'otherwise depre'ssing'the casing into thegroove ofthe ring as indicated at 13. In the latter case'the' wedge orother suitable piece hereinbefore mentioned would be driven between thepipe and ring at a point diametrically opposite the lug 28. In the formshown by Fig, 3 the pipe and ring woulden'ter through the top of thecasing; A flange 30on the pipe is arranged to engage the flange 22 topositionthe pipe.

The waste pipe may be installed before the trap is installed, in whichcase the discharge end of pipe13 would be screwed upo'n the waste pipeby turning the entire trap. If, however, the trap be installed beforethe waste-pipe is installed, theolatter would be screwed into the pipe13. In either case the relativeturning'of the two pipes would involve atorsional stress upon the discharge end of pipe 13. Suchstress wouldnecessarily be great in order to make the screwthreads tight enough toprevent leaking, and would tend to loosen the solder joint at 23 unlesssome means were provided for bracing pipe13 against turning relativelyto the casing 10.' Such means is present in both modifications, theconnection between the upturned portion of pipe 13 and the ring 12 beingeffective for bracing the pipe so as to sustain the torsional stressreferred to. This relieves the solder joint at 23 from sustaining suchstress, and eliminates the likelistrain is sustained directly by theflange 22 as well as by the'solder 23. sufiiciently to afford thenecessary strength 2. A trap comprising a casing composed of softductile metal and having a rim at its upper end, a cap for said casing,a cap-receiving ring arranged within said casing and a substantialdistance below said rim, said ring having a circumferential groove andsaid casing having an internal annular ofl'set portion occupying saidgroove, said ring and cap having cooperative connecting screw-threads,and an outlet pipe joined with said casing below said ring andprojecting into said casing and ring, the receiving end of said pipebeing above the screwthreads of said ring, and the rim of said casingbeing above the receiving end of said pipe.

3. A trap comprising a casing, a ring arranged in and joined to saidcasing, an outlet pipe projecting into said casing and into said ring,said pipe being joined with the wall of said casing, and a Web extendingfrom said ring to said pipe to brace the latter.

4:. A trap comprising a casing, a ring arranged in and joined to saidcasing, a cap, said ring and cap having cooperative connectingscrew-threads, an outlet pipe joined With the wall of said casing andprojecting 7 into said casing, and means connecting said ring and pipeto cause the latter to sustain rotative stresses transmitted by said capto said ring.

5. A trap comprising a casing, a ring arranged in and joined to saidcasing, a cap, said ring and cap having cooperative connectingscrew-threads, an outlet pipe joined with the side wall of said casingand prov jecting into said casing, the receiving end portion of saidpipe being within said ring, the axis of the joined portion of said pipebeing substantially radial with relation to the axis of said ring, andmeans connecting said ring and pipeto cause the latter to sustainrotative stresses transmitted by said cap to said ring.

6. A trap comprising a casing, an outlet pipe joined with the side wallof the casing, said pipe having a portion extending into said casing andupwardly therein, a ring within said casing and joined to the side wallthereof, said ring being arranged to surround said portion and having acapreceiving screw-thread, and means arranged to transmit rotativestress from said ring to said pipe to brace said ring against movementrelatively to said casing.

7. A trap comprising a casing, an outlet pipe a portion of which isjoined to the wall of said casing, another portion of said pipeprojecting into the casing, and means in said casing and coacting withthe latter and with said other portion to sustain torsional stressapplied to said joined portion of said pipe.

In testimony whereof I have aflixedrmy signature, in presence of twowitnesses.

JOHN H. CARR.

Witnesses:

W. P. ABELL, P. W. PEzzET'rI.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

Washington, D. C. A

